Travelling wave identification method of superhigh voltage DC line fault

A DC line fault and identification method technology, applied in the direction of fault location, emergency protection circuit device, electrical components, etc., can solve the sudden change of DC voltage and DC current, traveling wave protection is easy to malfunction, and it is not easy to distinguish whether the line is damaged or not. problems such as lightning strikes, to achieve the effect of avoiding lightning and clear algorithm concept

Active Publication Date: 2006-11-29
NR ELECTRIC CO LTD
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AI Technical Summary

Problems solved by technology

[0017] The shortcomings of the existing traveling wave identification method for ultra-high voltage DC line faults: when lightning (lightning strike) hits the line, the traveling wave protection is easy to malfunction
When lightning (lightning strike) hits the line, it will cause a sudden change in DC voltage and DC current; but in most cases the line is not damaged, and it can still operate normally after the lightning (lightning strike)
Existing traveling wave protection is not easy to distinguish whether the line is struck by lightning

Method used

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  • Travelling wave identification method of superhigh voltage DC line fault
  • Travelling wave identification method of superhigh voltage DC line fault

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Embodiment Construction

[0056] To read the sampled value, use the figure 2 The block diagram of the realization of the protected action.

[0057] During the implementation of the algorithm, there is some time coordination, mainly including delay, stretching, and waiting. The main reason is that the timing of the fault response is different for each judgment quantity when the location of the line fault is different. Preventing misoperation is also what needs to be considered when selecting the size of these time values.

[0058] Setting value selection reference: Different power transmission projects can adopt different parameters. Taking Genan Project as an example, the common mode sudden change value is about 300kV / ms, the differential mode integral value is about 210kV, and the common mode integral value is about 350kV.

[0059] In the figure, OP means the other pole, and the 'traveling wave differential mode common mode' module completes the functions of formulas (2)-(5).

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Abstract

This invention relates to a method for identifying traveling waves of super-high voltage DC circuit faults, which applies a reverse identification method: A, judgment of fault pole: Wcx=Diff_bx(t)*Com_bx(t), in which, x=1,2, if the short time integral value of Wcx is greater than a constant value, then it is decided that the local pole is fault, otherwise, it is not, B, abrupt volume of traveling waves, C, integral volume of the traveling waves, D, testing if the DC current is over the constant value or the DC voltage meets the criterion of the low constant value, A to C or D make up of the action conditions of the circuit traveling wave protection.

Description

1. Technical field [0001] The invention relates to a traveling wave identification method for a DC line fault in a high-voltage direct current transmission system and a related relay protection device. 2. Background technology [0002] Due to its unique advantages, such as: long distance, high power, asynchronous networking, fast power adjustment, power flow controllability, transmission economy, etc., HVDC transmission is more and more widely used. The core of the HVDC transmission system is the HVDC control and protection system, which includes a control system and a protection system. DC transmission lines are essential equipment in long-distance HVDC transmission systems. [0003] DC line faults are common faults in HVDC transmission systems. Among them, the traveling wave identification method is an effective DC line protection method. The DC voltage of the HVDC transmission system is always at a high voltage (relative to the earth), which is obviously different from...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/08
Inventor 李海英王俊生卢宇
Owner NR ELECTRIC CO LTD
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